Lockdown Mode will be available in the autumn with the next operating system across all of the company's iPhones, iPads and Macs.
The setting blocks certain functions and prevents unknown users from calling.
It comes after Apple devices owned by activists, politicians and journalists were infected with spyware.
Apple is currently suing Israeli spyware firm NSO Group, accusing it of targeting victims in 150 different countries with its powerful Pegasus spyware.
